Lower hybrid current drive for the steady-state scenario
Lower hybrid current drive for the steady-state scenario
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DOI：
10.1088/0741-3335/52/12/124031
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发表时间：
2010-11
影响因子：
2.2
通讯作者：
M. Goniche;L. Amicucci;Y. Baranov;V. Basiuk;G. Calabrò;A. Cardinali;C. Castaldo;R. Cesario;J. Decker;D. Dodt;A. Ekedahl;L. Figini;J. Garcia;G. Giruzzi;J. Hillairet;G. Hoang;A. Hubbard;E. Joffrin;K. Kirov;X. Litaudon;J. Mailloux;T. Oosako;R. Parker;V. Pericoli Ridolfini;Y. Peysson;P. Platania;F. Rimini;P. Sharma;C. Sozzi;G. Wallace
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文献类型：
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作者：
M. Goniche;L. Amicucci;Y. Baranov;V. Basiuk;G. Calabrò;A. Cardinali;C. Castaldo;R. Cesario;J. Decker;D. Dodt;A. Ekedahl;L. Figini;J. Garcia;G. Giruzzi;J. Hillairet;G. Hoang;A. Hubbard;E. Joffrin;K. Kirov;X. Litaudon;J. Mailloux;T. Oosako;R. Parker;V. Pericoli Ridolfini;Y. Peysson;P. Platania;F. Rimini;P. Sharma;C. Sozzi;G. Wallace
报道了在接近稳态(SS)情况下的密度下进行的低混合电流驱动(LHCD)实验。在C-Mod、FTU和TORE SUPRA模型上，随着密度的增加，韧致辐射有很强的衰变，比LHCD模型的预测快得多。在JET上，LH光功率沉积对等离子体密度也很敏感：LH光功率调制表明，当密度接近JET SS情形的要求时，LH光功率沉积向等离子体边缘移动(r/a∼0.9时)。从本实验中还可以从电子回旋发射谱的重建中发现，LHCD效率随着密度的增加而降低。通过对不同密度和波平行折射率下的不同射流脉冲的LHCD模拟，得出结论：波可及条件不是解释效率下降的关键参数。C-MOD、FTU和TORE SUPRA实验表明，等离子体边缘参数，即密度和温度，以及波动，都通过可能是碰撞衰减(C-MOD)、参数衰变不稳定性或波散射(FTU/TORE SUPRA)的损耗机制来影响效率。
Lower hybrid current drive (LHCD) experiments performed at a density close to that required for the steady-state (SS) scenario are reported. On C-Mod, FTU and Tore Supra, a strong decay of the bremsstrahlung emission is observed when the density is increased, much faster that the prediction of LHCD modelling. On JET, LH power deposition is also found to be sensitive to the plasma density: LH power modulation indicates that the power deposition moves to the very edge of the plasma (r/a ∼ 0.9) when the density approaches the requirement of the JET SS scenario. From this experiment but also from the reconstruction of the electron cyclotron emission spectrum, the decrease in the LHCD efficiency with density is also found. From LHCD modelling of different JET pulses performed at different densities and wave parallel refraction indexes, it is concluded that the wave accessibility condition is not the key parameter for explaining the decrease in the efficiency. C-Mod, FTU and Tore Supra experiments indicate that the plasma edge parameters, namely density and temperature but also fluctuations, are affecting the efficiency via loss mechanisms which are likely to be collisional damping (C-Mod), parametric decay instabilities or wave scattering (FTU/Tore Supra).